CVE-2025-39698

high

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/futex: ensure io_futex_wait() cleans up properly on failure The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.

References

https://git.kernel.org/stable/c/d9f93172820a53ab42c4b0e5e65291f4f9d00ad2

https://git.kernel.org/stable/c/d34c04152df517c59979b4bf2a47f491e06d3256

https://git.kernel.org/stable/c/508c1314b342b78591f51c4b5dadee31a88335df

Details

Source: Mitre, NVD

Published: 2025-09-05

Updated: 2025-09-08

Risk Information

CVSS v2

Base Score: 6.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 7.3

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Severity: High

EPSS

EPSS: 0.00017